Cement-packer bag support



Aug. 24 1926. 1,597,006

A. M. BATES ET AL CEMENT PACKEJR BAG SUPPORT Filed August 28, 1925 inventor .4de/merMBates. Thomas H. Cosford.

attic-mag Patented Aug. 24, 1926.

UNITED STATES PATENT OFFICE.

ADELMER M. BATES AND THOMAS H. COSFORD, OF CHICAGO, ILLTNOIS, ASSIGNORS TO BATES VALVE BAG COMPANY, OF CHICAGO, ILLINOIS, A COBIQPRATION OF WEST VIRGINIA.

CEMENT-incline BAG surronm.

Application filed August 28, 1925. Serial No. 53,054.

Our invention relates to cement packers and has for its object to provide means in such packers for holding the bag in a satisfactor manner,-.and more particularly to 6 provi e holding means especially adapted 'for use with multi-walle'd paper valve bags closed at the ends by sewed seams.

In the accompanying drawings forming a part of this specification, Figure 1 is a side view, partly broken away, of a portion of a cement packer embodyingone form of our invention; Fig. 2 is a front view of the same mechanism, and Fig. 3 is a. detail showing the manner in which the filled bag rests i 9 16 uponthe bottom support.

The improvement is shown as applied to a cement packer, such as is described in the patent to Adelm'er M. Bates No.'1,209,105,

granted December 19, 1916. In this type of packer there is a frame A, which is supported upon a scale beamB, and the bag is supported in a cradle C, which in turn is mounted in the frame A.

The frame A comprises legs 10 which rest upon the forked ends 11 of the scale beam.

The legs 10 of the frame are connected at their lower ends, by a U-shaped bottom member 12. This bottom member is provided with lugs 13. L- shaped bottom members 14 of cradle C are pivoted at 15 to the lugs 13.

Substantially vertical legs 16 extend upward from the'rear of the L-shaped members and have converging portions 17, which meet at 18 at the top of the cradle. Near 3 the upper end of the vertical portions of the le s they are connected on the rear side by a breast strap 19 against which the bag may rest.

- An apron 20 surrounding a filling tube 21 is mounted upon the frame A in position to co-operate with a suitable cement-delivering apparatus. A valve bag 22 may bepositioned in the cradle with tube 21 thrust into its valve opening. The bag shown in the drawin s is apaper bag with a sewed seam 23 at t e top and a sewed seam 24; at the bottom, and having at one corner a valve 25 through which the filling tube 21 is thrust.

At the sides of the filling tube there are bracket members26 and a bag-holding clamp 27 is pivoted at 28 in these brackets. vThe clamp is provided with a central notch: 29 on its lower side adapted to receive the top seam 23 of the bag.- The clamp is shaped on the two sides of the notch so that it will firmly clamp the walls of the bag beneath- .the seam against the filling tube. I

Directly beneath the filling tube there is a I bag chair 30 having ears 31, which are adapted to contact the rear sides of the legs16, and having pins 32 adapted to enter notches 33 in the front side of the legs, the

chair being supported by these pins. A

movable latch pin 34 normally projects back of leg 16 and prevents the tilting of the chair relatively to legs 16. Thereare series of notches 33, as shown, and, when it'is desired to raise or lower the chair for adjustment purposes, latch 3tmay be withdrawn and the chair tilted sufficiently to re shaped cross-piece 36, which provides between its legs a notch 37 adapted to receive the lowerend of the bag. When the bag is empty, as shown in Fig. 2, the lower end rests within notch 37. As the bag is filled, the sidesare spread apart, and at the same time the bag is shortened .so that as the sides are spread apart they contact surfaces 35 and rest upon those surfaces, as indicated in Fig.3.

A latch hook 39 is attached to the stationary frame of the cement-supplying device, and a co-operating hook 40 is fixed on the upper end of the cradle. A control handle 41 is suspended by a link 42 from a fixed point above, the cradle'and is connected by a link 43 to the cradle. A releasing member 44 is provided on the cradle and is adapted to contact a pawl pivoted to the clamping member 27 and release said member when the cradle is tipped forward.

The apparatus operates in a general way the same as in the patent above referred to. The manner of supporting the control handle 41 and some other features are as shown in the co-pending application of Adelmer M. Bates, Serial No. 570.666, filed June 24, 1922. The valve of an empty bag is placed over the filling tube, as shown in Figs. 1 and 2, and clamp 27 receives the up- .per scam in notch 29 so that the upper end of the bag is accurately positioned upon the filling tube and there will be equal strain upon both side walls of the bag. lVhen this notch is not provided, the seam is bent against one wall of the bag in order to allow clamping action of the clamp. and in such bending of the seam there is a tendency to draw the bag to one side or the other of the tube with the result of causing the supporting strain to fall more upon one side of the bag than upon the other. Furthermore,

' the notch allows the clamp to firmly press the bag walls on each side against the filling tube beneath the seam, so that a portion of the pull upon the walls 2f the bag is taken up by the clamp and the strain upon the seam over the filling tube is thereby lessened. The strain at this point of the seam is greater during the filling operation than it is at any other time in the use of the bag, and sometimes results in ripping or tearing the bag at the seam when particular means is not employed for preventing this result. The clamp arranged as specified, by taking up a portion of the strain before it reaches the seam and by keeping the bag in accurate position upon the filling tube so that both sides share the strain equally, reduces the danger of damage to the seam at this point.

The bottom of the bag hangs down farther when empty than it does when filled. If a support is provided directly beneath the filling tube, upon which the end of the filling bag might rest, the bag must be bent spread and continues to afford sideways or crumpled up at the start, and this interferes with the filling operation. On the other hand, if the support is placed at such a distance from the filling tube that the bag may be straight when empty, the lower end of the bag is drawn up away from the support when filled. The particular form of bottom support we have devised avoids this difficulty by sloping outward from the central notch at such an angle that, while the bag is allowed to hang perfectly straight when empty, the bottom affords support for the sides of the bag as they are such support when the bag is filled.

This is particularly important with paper bags having sewedseams, as the bending or crumpling of such bags is more of a detriment than where cloth bags are used, and it is also desirable. to avoid, as far as possible, excessive strain upon the seam of the bag. Nevertheless, the bottom support acts in the same way with. a cloth bagfand the notched clamp at the top is likewise useful with a cloth bag. In other words, while these particular modifications of the clamp member and the support for the bottom of the bag are particularly useful where the apparatus is employed in filling paper bags with sewed seams, the improvements are likewise useful with other forms of bags.

It will be readily understood that various modifications may be made in the exact contour of the clamp and of the bottom support while retaining the essential features of our invention, and the exact mechanism shown and described above is merely but one form in which our invention might be embodied. The scope of our invention is defined by the appended claims.

\Vhat 'we claim is: i

1. In a bag filling machine, a filling tube adapted to receive a valve bag thereover and to support the upper end of the bag, and a bottom support provided with a slot direct- 1y beneath and parallel with said tube and having shoulders at the sides of the slotadapted to support the bottom of a filled bag.

2. In a bag filling machine, a filling tube adapted to receive a valve bag thereover and to support the upper end of the bag, and a bottom support provided with a slot directly beneath and parallel with said tube and having shoulders at the sides of the slot sloped towards the slot at such an angle that they suppgrt the bottom of the bag as soon as it begins to spread to a material extent and continue to support it as the bag spreads to its full size.

3. In a machine for filling a valve bag having its valved end closed by a seam, a filling tube adapted to receive a valve bag thereover, and a clamp above the tube and having a slot to receive the seam and having a clamping surface at each side of the slot adapted to clamp the bag wall at each side of the seam against the filling tube.

4. In a bag filling machine, a bag filling tube adapted to have a bag hung thereon, means to clamp the bag against the tube adj acent, but not at, the top of the tube, and a bottom support for the bag, said bottom support being slotted alon a line directly beneath and parallel with and having shoulders at the sides of said said filling tube,-

slot rounded towards said slot and adapted i filling tube adapted toreceive such a bag thereover and to support the upper end of the bag, a clamp above the tube and having a'slot to receive the seam at the top end of the bag and adapted to clamp the ba-,; Wall 5 at each side of the seam against the filling tube, and a bottom support having a slot therein directly beneath and parallel with the filling tube and adapted to receive the bottom seam of the bag and having shoulders at the sides of the slot sloping at such 19v signed our names to this specification.

ADELMER M. BATES. THOMAS H. COS FORD. 

